The northern flicker (Colaptes auratus) is a medium-sized member of the woodpecker family. It is native to most of North America, parts of Central America, Cuba, the Cayman Islands, and is one of the few woodpecker species that migrate. There are over 100 common names for the northern flicker. Among them are: yellowhammer (as it's known as the state bird of Alabama), clape, gaffer woodpecker, harry-wicket, heigh-ho, wake-up, walk-up, wick-up, yarrup, and gawker bird. Many of these names are attempts at imitating some of its calls.

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The northern flicker is part of the genus Colaptes which encompasses 12 New-World woodpeckers. There are two living and one extinct subspecies of C. auratus. The existing sub-species were at one time considered separate species but they commonly interbred where ranges overlap and are now considered one species by the American Ornithologists Union. Whether or not they are separate species is a well-known example of the species problem.

The yellow-shafted flicker (Colaptes auratus auratus) resides in eastern North America. They are yellow under the tail and underwings and have yellow shafts on their primaries. They have a grey cap, a beige face and a red bar at the nape of their neck. Males have a black moustache. Colaptes comes from the Greek verb colapt, to peck. Auratus is from the Latin root aurat, meaning "gold" or "golden" and refers to the bird's underwing.

The red-shafted flicker (Colaptes auratus cafer) resides in western North America. They are red under the tail and underwings and have red shafts on their primaries. They have a beige cap and a grey face. Males have a red moustache. The scientific name, Colaptes auratus cafer, is the result of an error made in 1788 by the German systematist, Johann Gmelin, who believed that its original habitat was in South Africa among the Xhosa people, then known as the "Kaffir" people.

Adults are brown with black bars on the back and wings. A mid-to-large-sized woodpecker measures 28–36 cm (11–14 in) in length and 42–54 cm (17–21 in) in wingspan.[3][4] The body mass can vary from 86 to 167 g (3.0 to 5.9 oz).[5] Among standard scientific measurements, the wing bone measures 12.2–17.1 cm (4.8–6.7 in), the tail measures 7.5–11.5 cm (3.0–4.5 in), the bill measures 2.2–4.3 cm (0.87–1.69 in) and the tarsus measures 2.2–3.1 cm (0.87–1.22 in). The largest-bodied specimens are from the northern stretches of the species range, such as Alaska or Newfoundland and Labrador, whereas the smallest specimens come from Grand Cayman Island.[6] A necklace-like black patch occupies the upper breast, while the lower breast and belly are beige with black spots. Males can be identified by a black or red moustachial stripe at the base of the beak. The tail is dark on top, transitioning to a white rump which is conspicuous in flight.

This bird's call is a sustained laugh, ki ki ki ki, more congenial than that of the pileated woodpecker. One may also hear a constant knocking as they often drum on trees or even metal objects to declare territory. Like most woodpeckers, northern flickers drum on objects as a form of communication and territory defense. In such cases, the object is to make as loud a noise as possible, and that’s why woodpeckers sometimes drum on metal objects.

According to the Audubonguide, "flickers are the only woodpeckers that frequently feed on the ground", probing with their beak, also sometimes catching insects in flight. Although they eat fruits, berries, seeds and nuts, their primary food is insects. Ants alone can make up 45% of their diet. Other invertebrates eaten include flies, butterflies, moths, beetles, and snails. Flickers also eat berries and seeds, especially in winter, including poison oak and ivy, dogwood, sumac, wild cherry and grape, bayberries, hackberries, and elderberries, and sunflower and thistle seeds. Flickers often go after ants underground (where the nutritious larvae live), hammering at the soil the way other woodpeckers drill into wood. They have been observed breaking into cow patties to eat insects living within. Their tongues can dart out 50 mm (2.0 in) beyond the end of the bill to snare prey. As well as eating ants, flickers have a behavior called anting, during which they use the acid from the ants to assist in preening, as it is useful in keeping them free of parasites.

Flickers may be observed in open habitats near trees, including woodlands, edges, yards, and parks. In the western United States, one can find them in mountain forests all the way up to treeline. Northern flickers generally nest in holes in trees like other woodpeckers. Occasionally, they have been found nesting in old, earthen burrows vacated by belted kingfishers or bank swallows. Both sexes help with nest excavation. The entrance hole is about 7.6 cm (3.0 in) in diameter, and the cavity is 33–41 cm (13–16 in) deep. The cavity widens at bottom to make room for eggs and the incubating adult. Inside, the cavity is bare except for a bed of wood chips for the eggs and chicks to rest on. Once nestlings are about 17 days old, they begin clinging to the cavity wall rather than lying on the floor.

The oldest yet known "yellow-shafted" northern flicker lived to be at least 9 years 2 months old, and the oldest yet known “red-shafted” northern flicker lived to be at least 8 years 9 months old.[citation needed]

Their breeding habitat consists of forested areas across North America and as far south as Central America. They are cavity nesters who typically nest in trees but they will also use posts and birdhouses if sized and situated appropriately. They prefer to excavate their own home although they will reuse and repair damaged or abandoned nests. Abandoned flicker nests create habitat for other cavity nesters. Flickers are sometimes driven from nesting sites by another cavity nester, the European starling.

It takes about 1 to 2 weeks to build the nest which is built by both sexes of the mating pairs. The entrance hole is roughly 5 to 10 cm (2.0 to 3.9 in) wide.

Northern flicker feeding juvenile at nest cavity entrance

A typical clutch consists of 6 to 8 eggs whose shells are pure white with a smooth surface and high gloss. The eggs are the second largest of the North American woodpecker species, exceeded only by the pileated woodpecker's. Incubation is by both sexes for approximately 11 to 12 days. The young are fed by regurgitation and fledge about 25 to 28 days after hatching.